LTC2972 datasheet(72/112 Pages) LINER

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LTC2972

2972fa

For more information www.linear.com/LTC2972

STATUS_MFR_SPECIFIC

The STATUS_MFR_SPECIFIC command returns manufacturer specific status flags. Bits marked CHANNEL = All are

not paged. Bits marked STICKY = Yes stay set until a CLEAR_FAULTS is issued or the channel is commanded on by

the user. Bits marked ALERT = Yes pull ALERTB low when the bit is set. Bits marked OFF = Yes indicate that the event

can be configured elsewhere to turn the channel off.

STATUS_MFR_SPECIFIC Data Contents

BIT(S) SYMBOL

OPERATION

CHANNEL

STICKY

ALERT OFF

b[7] Status_mfr_discharge

1 = A VOUT discharge fault occurred while attempting to enter

the ON state.

0 = No VOUT discharge fault has occurred.

Current Page

Yes

b[6] Status_mfr_fault1_in

This channel attempted to turn on while the FAULTB1 pin was

asserted low, or this channel has shut down at least once

in response to a FAULTB1 pin asserting low since the last

CONTROL pin toggle, OPERATION command ON/OFF cycle or

CLEAR_FAULTS command.

Current Page

Yes

b[5] Status_mfr_fault0_in

This channel attempted to turn on while the FAULTB0 pin was

asserted low, or this channel has shut down at least once

in response to a FAULTB0 pin asserting low since the last

CONTROL pin toggle, OPERATION command ON/OFF cycle or

CLEAR_FAULTS command.

Current Page

Yes

b[4] Status_mfr_servo_target_reached Servo target has been reached.

Current Page

b[3] Status_mfr_dac_connected

DAC is connected and driving VDAC pin.

Current Page

b[2] Status_mfr_dac_saturated

A previous servo operation terminated with maximum or

minimum DAC value.

Current Page

Yes

b[1] Status_mfr_auxfaultb_faulted_off AUXFAULTB has been de-asserted due to a VOUT or IOUT fault.

All

b[0] Status_mfr_watchdog_fault

1 = A watchdog fault has occurred.

0 = No watchdog fault has occurred.

All

Yes

MFR_PADS

TheMFR_PADScommandprovidesread-onlyaccessofdigitalpads(pins).Theinputvaluesarebeforeanydeglitchinglogic.

MFR_PADS Data Contents

BIT(S) SYMBOL

OPERATION

b[15]

Mfr_pads_pwrgd_drive

0 = PWRGD pad is being driven low by this chip.

1 = PWRGD pad is not being driven low by this chip.

b[14]

Mfr_pads_alertb_drive

0 = ALERTB pad is being driven low by this chip.

1 = ALERTB pad is not being driven low by this chip.

b[13:12] Mfr_pads_faultb_drive[1:0]

bit[1] used for FAULTB0 pad, bit[0] used for FAULTB1 pad as follows:

0 = FAULTB pad is being driven low by this chip.

1 = FAULTB pad is not being driven low by this chip.

b[11:10] Mfr_pads_pg_drive[1:0]

bit[1] used for PG1 pad, bit[0] used for PG0 pad as follows:

0 = PGn pad is being driven low by this chip

1 = PGn pad is not being driven low by this chip

b[9:8] Mfr_pads_asel1[1:0]

11: Logic high detected on ASEL1 input pad.

10: ASEL1 input pad is floating.

01: Reserved.

00: Logic low detected on ASEL1 input pad.

PMBus COMMAND DESCRIPTION

LTC2972 Datasheet(PDF) 72 Page - Linear Technology

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